french



G. P. FRENCH. HEATING FURNACE.

2 SheetsS1 1eet 1. I

(No Model.)

No. 474,316. Patented May 3, 1892.

A i T W r witnesses:

(No Model.) 2Sheets-Sheet 2.

G. F. FRENCH.

HEATING FURNACE.

Patented May 3, 1.892.

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Uivi'rnn STATES PATENT OFFICE.

GEORGE F. FRENCH, OF EVANSTON, ILLINOIS, ASSIGNOR TO LULU E. FRENCH, OF SAME PLACE.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 474,316, dated May 3, 1892- Application filed October 26, 1889. flerial No. 328,270. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. FRENCH, of Evanston, in the countyof Cook and State of Illinois, have invented certain new and usefiil Improvements in Heating-Furnaces, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming a part of this specification, in which- IO Figure l is a front elevation of a furnace embodying the features of my improvement. Fig. 2 is a vertical sectional view thereof, taken upon the line 20 10, Fig. 1. Fig. 3 is a like View showing the removable front and ash- -pit door in abnormal positions. Fig. 4 is a sectional View in plan taken upon the line x (/13, Fig. 2. Fig. 5 is a plan view in detail of the annular ring for holding the fire-pot as it appears when in position above the case which forms the ash-pit; and Fig. 6 is a sectional view in detail of a portion of the ash-pit case, showing an enlarged fire-pot in position, the annular ring being removed.

Like letters of reference in the different figz 5 ures indicate like parts.

My invention relates to heating-furnaces; and my object, primarily, is to so construct a furnace that fire-pots of varying sizes may be employed therewith, so as to enable the heating capacity of said furnace to be increased or diminished without varying the size of the general structure. A further object is to render the front and coal-chute removable, so that workmen may have ready access to the 5 interior of the furnace for changing or cleaning the parts, all of which is hereinaftermore particularly described and claimed.

Referring to the drawings, Arepresents the body or outer case of the furnace, which is constructed of sheet metal in the usual cylindrical form, with the exception that the main portion of the front, extending nearly to the top, is fiat, as shown at a, Figs.1,2, and 4, said flat front consisting, preferably, of a castmetal plate boltedto the casing. Within the case is placed the bodyB of the furnace, having an ash-pit b, surrounded upon three sides by the casing b and closed in front by means of the door 12 which is hinged at the bottom, as shown, and provided with a counterpoiseweightb which serves to retain the same normally closed. A circular opening is formed in the plate b which covers the ash-pit, said opening being surrounded by a vertical flange 17 within which is a narrow ledge c, which may serve either as a directsupport for a firepot of the largest size, as indicated in Fig. 6,

or for an annular ring d, which is provided" with vertical annular flanges cl d so that when said ring is in position there are formed (-0 annular grooves d d of different diameters.

The fire-pot is constructed of a number of separate and removable sections 19, preferably of fire-brick, which rest upon the ledge c or upon the ring d, as the case may be, and are bound together by an encircling band 6, also formed in sections and detach-ably secured together, as by bolts at e. With these parts fire-pots of widely-different sizes may be constructed, it being simply necessary to select so many of the sections 19 as will form a pot of the desired diameter and then adjust or construct the encircling band accordingly. For example, Fig. 4 shows a pot of the smallest size that it is possible to construct of the 7 5 parts shown in the drawings. It is-made up of eight of the sections 1), resting upon the m ner margin of thering cl, the encircling band being made up of but two sections having their ends attached directly to each other. The pot thus constructed is held in its central position by the annular flange d, which engages the band 6. The pot shown in Fig. 3 is somewhat larger and is made up of ten of the sections 19, while the pot shown in Fig. 6 1s still larger, being made up of twelve of said sections. In order to enable the band 6 to encircle these larger pots, it may be made up of more than two sections, or else its ends may be connected by long bolts or tie-rods. The pot shown in Fig. 3 is centered by the flange (Z and the pot shown in Fig. 6 is centered by the vertical flange b of the casing 12', the ring (1 being in this latter case omitted.

The removability of the rest for the fire-pot 5 of smaller diameter is a desirable feature, because if it were not removable it would form aledge or shoulder that would support a quantity of ashes when the fire-pot of larger size is used. Such a bed of ashes resting against the inner face of the fire-pot would materiallyprevent the radiation of heat, and thereby lessen the effectiveness of the furnace. Above the fire-pot and restingloosely thereon is placed a circular metal guard f, which is intended to prevent the fuel from falling overthe edge of the fire-pot. Loosely attached to the front a by means of bent pintles g g, extending through perforations in said front, is a supplemental removable front g, which is secured to the top by means of turn-buttons g g opening in the usual way. The coal-chute his rigidly attached to said movable front and may be removed and the pot adjusted, as indicated in Fig. 6; but this is not necessary.

I claim- 1. A furnace having a grate, a rest for a tirepot of one size situated in proximity thereto, and a removable rest for a fire-pot of a smaller size, substantially as set forth.

2. A furnace having a grate, a rest for a firepot of one size situated in proximity thereto, and a removable rest for a fire-pot of a smaller size projecting inward over the grate, substantially as set forth.

3. A furnace having the grate 7t, the rest 0 for a fire-pot of one size situated in proximity thereto, and the removable rest d, adapted to rest upon the rest 0 and project overthe edge of the grate for supporting a fire-pot of smaller size, substantially as set forth.

4. A furnace havinga grate, a rest for a firepot of one size situated in proximity thereto, and a removable rest for a fire-pot of a smaller size situated within the first-named rest, in

combination with a knockdown fire-pot consisting of a number of separate narrow sections or staves and an adjustable encircling band, substantially as set forth.

5. In a furnace,a grate, a rest for a fire-pot of one size situated in proximity thereto, and a removable rest for a fire-pot of smaller size projecting inward over the grate, in combination with a knockdown fire-pot consisting of a number of separate narrow sections or staves and an adjustable encircling band, substantially as set forth.

6. In a furnace, a grate k, a rest 0 for a firepot of one size situated in proximity thereto, and the removable ring d, adapted to rest upon the rest 0 and project over the edge of the grate, said ring having a rest for a fire-pot of smaller size, in combination with a knockdown fire-pot consisting of a number of narrow sections or staves and an adjustable encircling band, substantially as set forth.

7. The combination, with the gratek and the casing 19', having flange c, of the removable ring d, adapted to rest upon the flangec and having the concentric annular flanges d and (1 forming, with the upper margin of the casing 19, two concentric grooves (Z and d, the hand e, having means for adjusting it so that it may rest in either of said grooves, and the removable-fire-pot sections or staves encircled by said band and resting on one or the other of said flanges, substantially as set forth.

8. In a furnace, the combination, with the grate and fire-pot, of a casing having a removable side section, a feed-door formed therethrough, and a chute secured to and carried by said section and projecting over the firepot, substantially as set forth.

In testimony whereof I have signed this specification, in the presence of two subscribing witnesses, this 18th day of October, 1889.

GEORGE F. FRENCH.

Witnesses:

D. HORACE FLETCHER, J. HALPENNY. 

